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A pixel detector system for laser-accelerated ion detection

Sabine Reinhardt Fakultät für Physik, Ludwig-Maximilians-Universität München, Germany . A pixel detector system for laser-accelerated ion detection. Detection of laser-accelerated proton ( ion ) beams :. Ultra- short (<= ns ) highly intense (> 10 7 ions /cm 2 ) ion pulses

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A pixel detector system for laser-accelerated ion detection

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  1. Sabine Reinhardt Fakultät für Physik, Ludwig-Maximilians-Universität München, Germany A pixel detector system for laser-accelerated ion detection

  2. Detectionoflaser-acceleratedproton (ion) beams: • Ultra-short (<= ns) highlyintense (> 107ions/cm2) ionpulses • EMP presence • Mixed radiation background • Large energy spread of ions g Challenge for any electronic online detector

  3. Pixel detector as online detector in Thomson spectrometer: • real time measurement • excellent spatial resolution • good energy resolution • 108particles / cm² • = • 1 particle / µm² • Investigated detector systems: • Kappa DX-4 (commercial system) • Timepix(scientific system) • collaboration with IAEP CTU Prague • RadEye(commercial system) A, N 1/4 A g1/4 N

  4. Munich 14 MV Tandem accelerator • Electrostatic accelerator • protons: 8- 25 MeV • 3 irradiation modes: • single particle • continuous • pulsed • 107 protons /cm2/ ns • g similar to laser ion pulse Unique possibilities to test detector response

  5. Kappa DX-4 Kodak CCD sensor KAI 1020 • 7.4 mm x 7.4 mm pixel size • 2 mm depletion depth commercial system integrating detector

  6. Summary • + Dynamic range: • 1 - 106 p/cm2/pulse • + Linear response • + Radiation hardness • (20 MeV, 107p/cm2): • 1000 shots • Charge sharing effects • Small sensitive area No choice for detector system

  7. Timepix(in collaborationwith IAEP CTU Prague) • Medipixcollaboration (CERN) • hybrid detector system • 300 mm Si-sensor • 256 x 256 pixel (50 x 50 mm2) • 3 different read-out modes: • Medipix mode (counting) • Timepix mode (time) • TOT mode (energy) Single event Double event cluster = adjacent pixel above threshold

  8. Summary • + Single particle response • + Linear response • + Good energy resolution • 65 keV @ 5239 keV • Large charge sharing effects • Small sensitive area • - Saturation and non-linear effects • 2.5 . 105 p/cm2 /pulse No choice for detector system

  9. Rad Eye detector system RadEye 1 sensor • Si-photodiode array • 48 mm x 48 mm pixel size • 2 mm depletion depth • large sensitive area: 25 mm x 50 mm commercial system integrating detector

  10. Single proton sensitivity Cluster pixel distribution: • Munich 14 MV Tandem accelerator • continuous beam • 15 MeV protons • ~ 104p/cm2/s Clusterdistribution: double hit single hit No charge sharing effects observed Single and double hits can be distinguished

  11. Munich 14 MV Tandem accelerator • pulsed beam • 20 MeV protons • 104 - 107 p/cm2/ns No saturation observed Good agreement to continuous measurements a b c d

  12. Radiation hardness • Munich 14 MV Tandem accelerator • continuous + pulsed beam • 20 MeV protons • <= 6 .1010 p/cm2 Lifetime n 90% residual dynamic range 3000shots (20 MeV, 107p/cm2) System ready for laser-ion-acceleration experiment !

  13. dipole set Al- foil • MPQ Atlas laser • 2.5 J, 30 fs, • focal spot 3 mm (FWHM) • 5-10 nm DLC foils • wide angle spectrometer • dipole set 2 x 0.5 T • entrance slit 0.3 x 140 mm2 • Eproton > 1 MeV DLC foil RadEye- System Entrance slit laser

  14. Sensor “C” Sensor “D” g Good agreement with Tandem calibration

  15. SRIM 2008: Energy loss simulation Energy conversion: 1.11 +/- 0.09 ADU/keV Test with witha-source: g good agreement

  16. MPQ Atlas laser • 400 mJ, 30 fs • 20-40 nm DLC foils • small angle spectrometer • only dipole 0.5 T • pinhole  2.5 mm • Eproton > 4 MeV

  17. Compact integrated system “RE4PC” Stand alone system • computer control and read-out electronics Compact size: 30 x 25 x 25 cm3 Parallel read-out of 4 RadEye detectors

  18. Astra Gemini laser • 4-6 J, 50 fs • focal spot: 3 mm (FWHM) • target: 75 nm plastic foil • p > 3.7 MeV • C > 20 MeV p 6+C ??

  19. Conclusion RadEye-Detector • Single proton sensitivity • Limited energy resolution • Sufficient radiation hardness • Linear pulse dose response up to 107 p/cm2 • No problems with EMP in laser-environment • RE4PC • Compact pixel detector system based on RadEye sensor developed • Sensitive area as large as 100 x 50 mm2 • Extension of functionality planned (trigger, read-out speed, ...) • RE4PC in routine use for laser accelerated proton and carbon ion detection

  20. Manythanksto Wolfgang Draxinger, and Walter Assmann Klaus Allinger, JianhuiBin, Wenjun Ma and Jörg Schreiber Carlos Granjaand Frantisek Krejci Thanks for your attention!

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